Liquid dispensing apparatus



sept. 1, 1931.

c. H. A'RYNQLD LIQUID DISPENS ING APPARATUS Filed Jan. 7', 1929 2 Sheets-Sheet l.A

attorney.

Sept l, 1931. K Q H, ARNOLD I 1,820,931

LIQUID DISPENSING APPARATUS Filed Jaln. '7, 1929 2 Sheets-Sheet 2 akku ne 1y.

, veniently near intesa-.appenni A unirsi) s,'l#.lvrlas PATENT ori-ICE enanas lnamzoan, or Darren, omo

LreUm nrsrananui errang/rus n apenas@ and :imam-y 7, 1ere. serial ne. seam.

This invention relates to liquid dis nsin apparatus having a measurin pump dgigne to be driven by a, motor.. e prlmary object of the apparatus is to dispense liquid at txmch more rapid rate than is possible with an idly than has been' feasible heretofore ywith motor driven dispensing apparatus.

Another object is to dispense .li uid' with great accuracy, and to maintain t is accu racy regardless ofthe speed at which the liquid is ispensed. `Another object is to snrround the operation of the ap aratus with safeguards which prevent acci ental or intentional manipulation of the controlling de'- vices in an improper sequence. Another object is to dispense quantities of liquid corresponding to a given unit of measurement, vor an even multiple of said unit, at each operation of the apparatus, and to provide for postponing the ecision as to how many units are to be pum of the desire pumped. Another object is to provide for control of the apparatus from a position conthe fuel tank of an automobile, regardlessof its position with reference `to the apparatus,- if it be within the reach of the delivery hose. v Y

In the accompanying drawings,

Fig. 1 is an elevational view, mainly in' section, of the pump and parts which operate it, and parts of the operating mechanism;

' Fig. 2 is a view of a portion of the mecha.- nism for'operatir the valve 39 shown in the upper part of the 'scharge pipe'in Fig. 1;

Fig. 3 is aview looking downwardly to# ward the `vline 3-3'in' Fig. 1, but'showing some parts of the operating and controlling mechanism located below this line; 1

Fig. 4 is a view showing in elevation parts' of the o rating and controllin mechanism, viewed in the left hand side og Fig. 3;

Fig.' 5 is a view of the stop member, detached from associated and` Fig. 6 shows a'portlon of the indicator, including the two scales carried thereby.

"d until within less than one operated appara-tus, and even more rap--I number of units have been ders. Since said chamber,

. low'er for use at filling stations for automobiles, and hereinafter it is to be thought of as pumping gasoline at a filling station. As pumps for filling stations are familiar to everybody I have deemed it unnecessary to illustrate or describe a complete apparatus. It will suice to describe the portions of the apparatus which my invention concerns.

check valve l29 prevents the return ofV gasoline to the suction chamber. Behind the cylinder 25and not seen in the drawin there is a chamber into which the cylinesr 25 discharges through a port 30, upon the down stroke ofits piston 31. In the top of this unseen "chamber there is a gravity-actuated check valve, past which. the gasoline iows to a discharge chamber, also unseen, and thence through a port 32 to the discharge pipe 33, which is common to the three cylincheckA valve and discharge'chamber are not shown, I refer to the corres ndiug parts belonging to cylin- 26, whillb parts are seen at the left of theder art of Fig. 1. Gasoline discharged from e c `linder 26 passes through the port 34 to the c amber 35, past the valve 36 to the discharge chamber- 37, which chamber is in communication through a `port 32 with the discharge Vpipe 33. It is to be understood that there is a valve chamber below cylinder -26 similar to the chamber 27, and that it communicates -with the suction chamber 28 through a check.. valve similar to valve 29.

Preferably a strainer 38 is placed in .the suction chamber 28. 'It is to be understood that While the apparatus I am about to describe ma be used for various y ,its present emgodixnent is designed morev f particularly the dischargepipe33 continues upward and connects to the usual ho'se whereby gasoline 'fis put the'hfuel tanks of automobiles.

Means'for operatin the valve 39 Iin the dischar e pipe, and t e purpose of the valve, will explained presently. Each of the three istons' is provided with a piston rod 40. n the present machine these -rods are rectangular in cross section. J ournaled on the discharge pipe 33 is a sleeve 41, which carries a double helical cam 42. That is, the portion of the cam which is cut away in Fig. 1 is a complement to the portion shown, with the result that at each revolution the tra-in are shown; these are seen in Fig. 1.,y namely, the 'main gear 45 and one -of the intermediate gears, 46. The latter is also seenv in Fig. 3. A

Each cylinder is designed to pump a certain volume of liquid at each stroke. In the present structure the capacity' of the cylinders is such that at each cycle of the machine, i. e.,

each revolution of the cam 42, one-half gallon of liquid is pumped. This, of course, is

an arbitrary matter and the parts may be so proportioned as to pump any 'desired quantity during each cycle. y

Operating mechanic Secured to the upper end of the sleeve 41 is what, for want of a better name, I shall call a stop-member, 50. As will presently apv pear, this is also a timing or controlling device. Above the member a vcam-plate 51 is lmounted upon a portion of the sleeve'41 which passes through the member 50. The cam 51 is loose on this extension, se it can Above the "f rotate with .reference thereto.

cam-plate 51 a ratchet wheel 52 is rev'olubly mounted on the pipe 33 and rests upon the upper' end of the sleeve 41. y Secured to this ratchet wheel is the main gear 45, previously referred to. Referring .now to Figf 3, two pawls, 53-53, will be found mounted on the stop-member 50. .These pawls are arranged tofbe pressed into engagement with the teeth of the ratchet 52 by springs 54-54, 'which springs are indicated with dotted lines, to avoid obscuring other parts. The pawls are normally held out of engagement with the ratchet by cams 55--55 forming part of the cam-plate 51, which cams engage studs 56-56 depending from the pawls. The parts are Y so shown in Fig. 3. The other ends of the springs are attached to'arms '537-57'` extending from the cam plate 51, for a reason which 5 will be given presently.

' The frame of this machine comprises a member 60, which is attached to other portions of the frame by'rods 61. The member 60 is shown in part only, and in- Fig. 3 all but a fragment of it is removed. l Revolubly mounted on one ofthe rods 61 is a U- shaped member or lever 62, one leg of the U bein above andthe other leg` below the memer 60, with the rod 61 passing freely through each leg.v A handle 63 secured to the base of the U is used in vmoving the memberv manually. Secured vto the upper leg of the Uis an arm 64, carrying` a roller 65 on its free end. See Fig, 4. A spring 66 tends constantly to draw the end of this arm toward thecenter of the machine and press the roller 65 against the perimeter of the stop-member 50. This spring also sezves to move the member 62 and the handle 63 in one direction, with the result that when the handle is moved manually in the direction-indicated by the arrowv in Fig. 3 it extends the spring 66, and as soon as the handle is vreleased the member 62, with the several parts attached, to it, returns to its normal position, which is that shown in Fig. 3.

y Mounted onthe lever 62, but elevated labove the arm 64, is" an arm 67,*the free end of which is bifurcated and embraces the depending arm 68 .of a bell crank 69. The bell crank is carried by a vmember 70 attached to the discharge pipe 33, an extension ci which member carries the gear 46. See Fig. 1. y lThe horizontal end 71 of the bell crank 69, is connected by a link 72 to an arm 73 itA whereby the valve 39 is operated. See Fig.

2. When the handle 63 is in the position it occupies in Fig. 3, the valve 39 is closed, as

in Fig-17 The lower leg of the 'lever 62 is connected by a link 74 to the switch 10 which controls the electric ,current for the motor 44. The switch i's indicated diagrammatically atk 75 in Fig. 3. When the handle 63 is in the position it occupies in Fig. 3 the current is cut off from the motor.

Operation of driving and controlling mecham'sm Moving the handle 63 clockwise, that is in the direction indicated by the arrow in Fig. 3, does four things, simultaneously: (a) It removes the end of the arm 64 from in front of the lug 7 6 which projects from the edge of the cam plate 51, allowing the springs 54--54 to rotate the cam-plate clockwise, as it is seen in Fig. 3, thereby removing the c ams 55--55 from behind the studs carried by the pawls 53 "and allowing the pawls to engage the teeth of the ratchet Wheel 52.` The rotary movement of the camplateis arrested by the-cams impingng on the studswhich connect the pawls4 to the 4stop member v50. '.(b) It opens the valve 39 in the discharge pipe. (c) It throws on the switch and starts the motor, and (d) 1::

it removes-the lstop-pawl 64 from engagement with the stop-member 50. Referring to Fig. it will be seen that at one point on its periphery the stop member is providedwith a notch 77, which I shall call an abutment, because the roller 65 carried by the arm 64 abuts the portion of this notch which is substantially radial and positively stops the pump at the moment the awls are lifted from the yratchet wheel. 'Iliie major part of the periphery ofthe stop-member is circular, and of sufficient diameter to hold' the arm 64 at the point to which it is moved for starting the apparatus. From each end of this circular part the periphery takes a spiral form to meet the notch 77. At the Y end of any revolution of the stop-member forms, unless the handle is lon'which to place a crank,

,through the gear 46 to much as onehalf gallon `merely counts the .'cycles.l 'of the indicatorcomprises a cylindrical rin 9a-anilla amide Pf the spring 66 will draw the arm inward and cause the undoing of the four functions which manual operation of the handle pdrmanually held in its operativeV position. Toward the-end of anyfcycle wherein the handle is not held by the operator, the lug 76 impinges on the end of the stop pawl 64, and the' cam-plate is thereby arrested.. The stop-member continuesto move, however, and this relative movement of the stop-member and'cam-plate causes the cams -55 tolift the pawls from the ratchet wheel at about the instant the stop pawl impinges on the abutment 77 and positively stops the pump. At the same time the motor switch is ,thrown out, and While the motor armature .will coast for a short time, this is unobjectionable, because the motor has been disconnected from the pump by the openingr of the clutch (lifting of the pawls 5353). At the same time the valve 39 is closed, which positively sto s the iow of liquidA in the discharge pipe. t has been found that Where pumps' are operated `at considerable speed the momentum of the liquid will cause an excessive flow of the liquid, of varying amount, at the end of the operaa tion, causingr inaccuracy in the amount of delivered. Itis possible that in some cases thev delivery hose has a siphoning action. This also is prevented by the .valve 39.

For operating the machine by handin an emergency, I provide a stationary stud 80 which is not shown. The crank connects to a beveled gear 81, revoluble on the stud. This gearl meshes withl a second beveled gear, 82, which is connected the gear 45. p v'Quantity indicating mechanism- I provide mechmnism for indicating to the customer .and to the o A verator the quantity of gasoline which has n delivered. Inasof gasoline is delivered at each cycle of the pum the indicator T e visible part which are two graduate -to the left, as seen in Fig. 3, causing ing adapted to engage with sight openings through which to view the graduations.

and at suitable Referring to Fig. 1. the casing is shown in part' at 91-91. At 92 a'siglit oiening is formed through which to -view t e upper scale, while at 93 a sight opening discloses the lower, scale. The graduated scales are so positioned on the rin that when any given reading shows througii one sight opening the saine reading shows through the other opening. The ring is mountedon a series of supporting rollers 94, and held down to its place by a series of retaining rollers 95. Referring more particularly to Fig. 3 it will be seen that the 'indicator ring is provided with an internal ratchet wheel 100. For the purpose of moving the ring step by step as the pump operates I provide a pair of levers 101-101, which are mounted on a supporting plate 102 and arranged to rock on studs 103. pawl 104, which is normally pressed to ratchet wheel 100 by a spring 105, these springs being indicated by dotted lines. At their other ends of the levers carry rollers 106, and these ends of the levers are drawn-toward each other by springs 107. The upper end'of one of the piston rods 40 is made Wedge-shape and upon the up stroke of the piston this Each lever carries at one end a wedge-shape end moves between the rollers 10G-100 'and presses the ends of the levers apart. hand pawl 104, as seen in Fig. 3, and the recession of the left hand pawl 104. Upon the down stroke of thewcdge the roller-carrying ends of the levers are drawn toward each other by the springs, causing-recession of the right hand and advance of the left h-and pawl. In this way the ring is advanced step by step, advancing a distance equal to one tooth of the ratchet at each cycle of movement of the pump.

' I provide means for resetting the indicator ring to-0 after each sale `of gasoline'.y To the underside ofthe supporting plate 102 a plate is secured by studs 111. These studs pass through oblique slots 112 formed in the 'plate 110, to the end that when the plate is moved on the studs it moves path. Depending from each stud 113, and when the plate in a diagonal pawl 104 is a 110 is moved the plate toalso move toward the pawls, t e edge of theplate 110 impinges on the studs 113', and rocking the pawls on their pivots lifts them fromthe ratchet 100. The edge which engagesthe studs is scolloped, each scollop beone stud. The. ring annular Harige 114, wrappedA a cord 115. See

90 is provided with an around which is Fig. 4. One end. I theange 115, While the other end is attached This causes advance of the rightof this cord is attached to pawl-lifting nection 127. See Fig. 3. Another branch of j 4per end in the supporting plate 102. vv2o to -and makes-a few turns around a sheave. 116. See Fig. 3. Connectedtothissheaveis a second sheave, 117 around which another -cord is Wound, with its inner=end anchored described. A vertical shaft 125 .is journaled.`

at its lower end in member 60, and at its pee igs. 3 and 4. An arm 126 rigidly attached (see Fig. 4) it attached to the to this shaft' plate 1.10 by a slot and pin con-- l this arm 126V extends under the ratchet wheel stud engages and moves 'ab through the slot `.from the wheel.

100, into the path As the indicating ring reaches the on its return after a'sale, this the arm 126, and and pin connection 127 it movesthe -pawl-releasing .plate 110 to the position it occupies in Fig. 3, thus restoring the v'indicating mechanism to operative con.-

dtion. L

Another arm, 130, secured to the shaft 1 25,

extends toward the arm 64. Loosely mounted on the shaft 125 is a.lever 131, one end of` which extends outthrough thecasing 91 of thema'chine and carries a thumb knob 132. The other end of this lever extends a short distance over the arm 130, and is adapted to engage a stud 133 carried by said arm 130. As seen in Fig. 3, movement of theknob 132 to the left will rock the shaft 125 clockwise, 45 doing two thingsz' (a) lifting the pawls 104--104 out of engagementmwith the ratchet Wheel 100, and (b) swinging the arm 1,30 to the right.- This bringsthe endof the arm 130 into the path of a lstud 134'carried by the stop-pawl been returned to their normal positions, that the indicator. As the lever 131 can only move the arm 130 in one direction this restoration cannot be effected by moving the knob 132 backward. When the handle l63 is operated to start the machine, the stud 134 carried by thest'op-pawl 64 moves into the path of the arm 1530 andprevents movement of-theA knob 132 until the pumping operation iss'topped.

.The operation of the parts of this machine have'bee' so resum is now necessary. When a customer wants gasoline the operator inserts the hose flow of many l leaves the mechanism of a stud 128 depending disconnecting the motor from the fully'described that only a brief, stopping thev pump and stopping the ow of nozzle into the car tank in the usual way'and he then moves the handle 63 to start the machine. He cannot move the handle while the indicator is returning .to.zero, so unless the indicator is left where itstopped at the last preceding operation, it is always at zero at thebeginning of 'a' delivery.

tion,- else of thecycle during -which he releases the handle. 'Thus there is no danger the pump and leaving the machine with the pump running,

allons of gasoline. -If the customer has as ed for a specified number of he operator f must hold'the handle in its operative posi-v the machine will .atopat the end of his starting which might result in an overgallons the operator holds the handle until| the indicator showsthat the pump has started to pump the last half-gallon of the amount ordered. Hethen releases the handle and tostop the pump at the propertime. If the customer orders his tank filled the operator Watches the. tank. and releases the handle when the tank -is nearly full. The most that will thereafter be pumped will beless than half of a gallon, so even ifthe tank overflows the amount lostiwill be small.`I

On the other hand, if the operator finds that the tank will hold still another half gallon he can move the handle to start themachine and-immediately release the handle, leaving the machine to sto itself, Having eiected' a settlement witht e customer, or having at leastinspected'the indicatorto lindout how much gasoline has been delivered, the operator pushes the, knob 132 inthe direction of the arrow, and thereafter thc resetting ofl the indicator takes care'of itself.

In manycases the handle the reach of the operator as he standsbeside the fuel tank of the customers ear.v :For this reason I provide for manipulating thehandlec3 win 'benut of witha cord 135. This cord is attached tothe s arm .64, and passing around a sheave 136 the cord passes through a hole. inthe top of the casing. From therethe cord can beconducted by suitable sheaves td the desired position,

--according to. the -local conditions. The operator can thenA start the machine by pulling 64, and prevents operation of the down on the cord. Y handle 63 to start the machine until after .the shaft andthe parts it controls 'have' I have illustrated and described what I` vno w'regard as thepreferred mechanical struclture wherefwith to carry out the p ur oses of my invention, but itis not to be un erstood that I limit myself tothe specific structure shown, as various modifications are o'ssible without de arture from the s lirit o my invention an Within the scope o the appended claims. Y v

I claim: 1.;-In a liquid dispenser, a motor, a pump driven thereby, and'means f or simultaneously ump,

liquid to the discharge pipe.

2. Ina liquid dispenser, 'a motor, a pump driven thereby, automatic Athe pump positively stop st op'ping the ow of liquihv to the disc argef Vquai'itity that has been whereby said stoppin .tive When a unit quantit ci, has been pumped, and manually operated and automatic means for sidriven thereby disconnecting the mptor from multa-neously ip e. P 3. In a li uid dispensena motor, a pump driven therdby, andmeans for simultaneous- Iydisconnecting the motor from the um stopping the. pump and closing a va ve in the discharge pipe. v

4. In a liquid dispenser, a motor,'a pump driven thereby, and means'for. positively stopping the pump when a predetermined quantity of liquid has been dispensed, for simultaneously disconnecting the motor from the pump and stopping the flow of liquidto' the discharge pipe..

5. in a li uid dispenser, a motor, a pump driven there automatic means for simultaneously stop ing the pump and positively stopping the 0W of vliquid therefrom when a predetermined quantit has been pumped, and means whereby pre etermination .of the quantity to be pumped may be postponed until thev desired pumped.

6. ln a liquid dispenser, a motor, a pump mea-ns for stopping` the pump and itively stoppin the iiovv of liquid there rom when a pre etermined quantity has been pumped, an indicator showing in units of measurement the pumped during the current operation of the apparatus, means means ,is only operaora multiple theremeans for preventing operation of said stopping means at the completion of the current unit quantity. Y

'l'. ln a liquid dispenser, an electric motor, a pump drivenl thereby, andm'eans for simultaneouslv'cutting the currentoi of the motor, positively stopping the pump and stopping the dow ci liquid in the discharge pipe. 8. in' a liquid dispenser, an electric motor, a pump driven thereby, and means for simultaneously cutting the current od of the motor, disconnecting the motor vfrom the pump, positively'stopping the opera-tion of the pump and stopping the dow of liquid in the discharge pipe. 9. In a liquid dispenser, an electric motor, a pump, a clutch for connecting them, which clutch is normally open; a discharge pipe for liquid from the pump,an'valve in said pipe, which valve is normally closed; a positive stop for the pump, adapted to' stop the pump the instant said clutch is opened, manually operated means for simultaneously closingA the clutch, opening said valve, re-

" moving said stop and throwing on the motor ing the pum andA quantity has nearly been ,fof a desired number olosin said valve, .stoppin the unipand throwng off the-motor svvitgchuA 10. Ina liquidV dispenser, a motor, driven thereby through a clutch, a stop-mem'- ber carried by the pump, a stop-p avvl carried by a stationary part of the dispenser, 'and means for opening the clutch when said pawl is thrown into member. 1

11. In a liquid dispenser, a xn'oto'r, a pump driven .thereby through a clutch, a stop-member carried by the pump, a stop-pawl adapted to engage said member means for opening the clutch simultaneous with sto ping of the motor by the pawl, and means or simultaneouslyr closing a valve in the discharge pipe of the pump.

12. in a li'q a motor, a pump uid dispenser, driven thereby through a clutch, a stop-member carried by the pump, a stop-pawl adapted to engage said member and stop the pump, means for openin the clutch simultaneousl with stopping o' the ump v by the paw means for simultaneou y closing a valve in the discharge pi and a timer whereby operation of the a oresaiddevices is 'prevented except' when a predetermined quantity of liquid has been pumped.

13. In a liquid dispenser,'a motor-driven pump, an indicator showing in units of'measurement the quantity ofliquid pumped, means adapted to stop the pump after it has pumped a unit quantit ,and manually operable means for preventing operation of saidv stopping means until said indicator shows that the last of units of the liquid is beine' pumped.-

le. ln a liquid dispenser, a motor-driven pump, an indicator showing the quantity of liquid pumped, means cater back to zero after'each operation or" the pum means which prevents operation of said 'ack-setting means While the pump is in operation and means for preventing the pump being started While the indicator is returning tc zero.

l5. In a liquid dispenser, a motor-driven pump, an indicator showing the amount of liquid pumped, means forl detaching the iiidicator from the pump so the former can be4 an indicator whereby operated, and means be stopped only at the a quantity of liquid'ccrresponding to a given:

a Pump for' setting the indionding to a given l engagement with the, stop and stop the pump,

unit-of measurement, an indicator whereby to v show the number of c cles the pump has o erated, means where y the pump can stopped onlyv at the end of a cycle, a valve in the discharge pipe, and means whereby V said valve is closed simultaneously withthe stopping of the pump, to the end that the amount of liquid shall correspond with the amount shown on the indicator.

I CHARLES H. ARNOLD. 

